Evolutionary links. If you stop a species from evolving by not allowing that species to migrate, then those links are broken, and the span of events has changed from what it should have been. For example, if ancient primates hadn't been able to migrate, we wouldn't exist.
Modern reptiles tell what the brains of dinosaurs would have become. The crocodile is one of the oldest animals on the planet, and yet, it has only the old brain. The crocodile was around during the time of the dinosaurs, and yet, it's brain hasn't evolved. It doesn't know logic or reason. All it has are basic survival instincts.
Birds wouldn't know what to do with their wings if they didn't have a brain.
Who's to say that all the different primate species of humans didn't became the modern day human? You don't know what happened with the Neanderthals. They could have easily mated with other species of human. Also, it is safe to assume that the dominant life form is the most intelligent, because the most intelligent builds society focusing around itself, and dominates the entire planet. For example, humans run the earth.
Without earth's atmosphere, microorganisms can survive, but do you actually think that microorganisms are intelligent? There are basic elements that make up the structure of an organism, and those particular elements can't survive in just any atmosphere.
You also have to find a planet located at the same location of earth, orbiting around the same sized sun. If the sun was any bigger, we'd fry. If it was any smaller, we'd freeze.
Yes it does. The magnetic field is produced by the spinning of the core, but the moon is what stabilizes it. You didn't think the moon's only purpose was to serve the tides, did you?
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